Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Assets:
Net real estate investments	$ 28,407,459	$ 28,474,947
Cash and cash equivalents	2,131,846	1,545,046
Receivables and other assets	624,918	629,031
Total Assets	32,992,251	32,483,642
Liabilities and equity:
Secured debt	2,329,474	2,377,930
Lease liabilities	408,916	418,266
Total equity	16,691,017	16,881,572	$ 17,066,337	$ 16,506,627
Total liabilities and equity	32,992,251	32,483,642
VIE, Primary Beneficiary
Assets:
Net real estate investments	451,975	454,333
Cash and cash equivalents	13,760	15,547
Receivables and other assets	12,669	11,171
Total Assets	478,404	481,051
Liabilities and equity:
Secured debt	165,225	165,671
Lease liabilities	1,325	1,325
Accrued expenses and other liabilities	16,860	14,997
Total equity	294,994	299,058
Total liabilities and equity	$ 478,404	$ 481,051